备份CentOS-Base.repocd/etc/yum.repos.dcpCentOS-Base.repoCentOS-Base.repo.bak将本地源替换为阿里云源wget-O/etc/yum.repos.d/CentOS-Base.repohttp://mirrors.aliyun.com/repo/Centos-7.repo清除yum缓存并更新yummakecacheyum-yupdatetips如果在yummakecache过程中一直报错：另一个应用当前持有yum锁；等待它退出...不要惊慌，只需输入以下命令rm-f/var/run/yum.pid
